SRAM Rival E1 DUB crank arm with a power meter, designed for road bikes and compatible with SRAM DUB bottom brackets. It measures the left leg’s pedaling force and calculates total power, with an accuracy of ±1.5%. It features IPX7 waterproof protection and Bluetooth and ANT+ wireless connectivity. It runs on one AAA battery, with an approximate operating life of 400 hours.